JP2001025086A - System and hall for stereoscopic sound reproduction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system and a hall for stereoscopic sound reproduction with which the effect of satisfactory sound image localization can be provided at any place by providing respective chairs with speakers. SOLUTION: Acoustic signals of acoustic corresponding to video or the like on a stage or screen S are sent to dedicated speakers 2R and 2L provided in respective chairs C and front ordinary speakers 7R and 7L and especially, the acoustic signals processed by a stereo dipole are sent to the respective dedicated speakers 2R and 2L by a stereoscopic sound reproducing device PA. By providing the respective chairs with the speakers, even when a person listening to sounds sits on any chair in a hall H, stereoscopic sounds based on satisfactory sound image localization can be enjoyed by a stereo dipolde system using the dedicated speakers 2R and 2L provided on the back of the chair just before that person.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a technique for reproducing three-dimensional sound, and more particularly, to provide a speaker in each chair so that an excellent sound image localization effect can be obtained in any place. It was made.

[0002]

2. Description of the Related Art In recent years, in the viewing of movies and television programs, the sound effects of video games and the stage, etc., sound such as sound effects has been reproduced so as to be heard from any direction viewed by a listener. The technology is known. Various types of such three-dimensional sound reproduction technology are specifically known, such as Dolby Surround (trademark). For example, a multi-channel recorded sound source is reproduced from a plurality of speakers provided around a listener. This allows the user to feel the direction in which the sound is heard and the movement of the sound.

[0003] Such a technique of reproducing three-dimensional sound is applied to a large place such as various venues, movie theaters, and halls, which is intended for a large number of people. They listened to the sound from a common speaker installed around them.

[0004]

By the way, in the above-mentioned prior art, in order to realize the direction in which the sound is heard by the combination of the intensity of the sound heard from each speaker, etc., the sound of the common speaker is increased. If you want to listen by number of people,
There is a problem that the effect of sound image localization is reduced depending on the position of the listener. In particular, in a large place such as a hall, the position of the seat varies greatly depending on the person, so that the sound image localization effect may be insufficient depending on the place such as a corner.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems of the prior art. The object of the present invention is to provide a speaker in each chair so that an excellent sound image localization effect can be obtained at any place. Is to provide a three-dimensional sound reproduction technology, that is, a three-dimensional sound reproduction system and a hall.

[0006]

In order to achieve the above object, a system for reproducing three-dimensional sound according to claim 1 is provided on a backrest,
A plurality of chairs provided with two left and right speakers facing the back, sound image localization calculating means for adding sound localization to a recorded or synthesized sound signal, and an acoustic signal output from the sound image localization calculating means And a crosstalk canceling operation means for performing processing for canceling crosstalk of each channel generated when the sound signal is output from the left and right speakers, and outputs the sound signal processed by the respective speakers to the respective speakers. And a three-dimensional sound reproducing device for sending. In the invention of claim 1,
By arranging the chairs vertically and horizontally, stereophonic sound with excellent sound image localization can be enjoyed not only at the center of the hall but also at each position by a stereo dipole method using a speaker provided on the back of the chair in front. For the person in the front row, only the speaker may be provided in front of the front row, and the back of the chair in the last row may not have the speaker.

According to a second aspect of the present invention, in the three-dimensional sound reproducing system according to the first aspect, the three-dimensional sound reproducing device is configured to output a sound signal between chairs adjacent to each other when the sound signal is output from each of the speakers. Second crosstalk cancellation calculating means for performing a process for canceling the generated crosstalk, and an audio signal having been subjected to the process for canceling each of the crosstalks, for each of the left and right channels provided in each of the chairs. Means for outputting from a speaker;
It is characterized by having.

According to the second aspect of the present invention, the sound of the speaker provided on the back of the chair in front reaches the ear of each person, but the crosstalk from the speaker of the chair in the immediate vicinity is canceled. The localization of the sound image becomes clear.

A three-dimensional sound reproduction hall according to a third aspect of the present invention is provided with a plurality of chairs arranged on the backrest, two left and right first speakers facing the back, and at least in front of each of the chairs. At least two left and right second speakers, sound image localization calculating means for adding sound localization to the recorded or synthesized sound signal, and the sound signal output from the sound image localization calculation means for the sound signal. A crosstalk canceling operation unit for performing a process for canceling crosstalk of each channel generated when a signal is output from the left and right speakers, and a sound signal processed by the crosstalk canceling unit is sent to at least each of the first speakers. And a three-dimensional sound reproducing device for reproducing the sound.
According to the third aspect of the present invention, at each position of the hall, not only the stereophonic system using the first speaker provided on the back of the chair in front can enjoy the stereophonic sound with excellent sound image localization but also the front of the hall. By using the second speaker provided, it is possible to enjoy a sound full of power and realism due to acoustic characteristics different from those of the first speaker and the reverberation of the whole hall.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention (hereinafter, referred to as the present embodiment) will be specifically described with reference to the drawings. Note that the portion related to the processing of the acoustic signal in the present embodiment can also be realized by controlling a CPU such as a computer by software. In this case, the software is created by combining instructions according to the description of this specification, and the technique described in the related art is used for the common parts with the above-described related art. In addition, in each drawing, the same members as those shown in the previous drawings are denoted by the same reference numerals, and description thereof will be omitted.

[1. Configuration] The present embodiment exemplifies a system and a hall for three-dimensional sound reproduction, and a speaker is provided in each chair so that an excellent sound image localization effect can be obtained at any place.

FIG. 1 is a conceptual diagram showing the entire configuration of a hole H according to the present embodiment. That is, the hall H of the present embodiment is provided with a stage or screen S provided on the front.
(Tentatively called a screen S), a plurality of chairs C arranged vertically and horizontally facing the screen S and a three-dimensional sound reproduction device PA.

The speakers used in this hall are 2
One of them is a first speaker (referred to as a dedicated speaker) 2R, 2L provided on the back of each chair C on the left and right two sides toward the back, and the other is each of these speakers. Two left and right second speakers (referred to as normal speakers) 7R and 7L provided in front of the chair C, that is, on both sides of the screen S.

FIG. 2 is a sectional view of the chair C as viewed from the side. As shown in FIG. 2, dedicated speakers 2R and 2L are provided on the back of the backrest 1 of the chair C via the soundproof material 3 as shown in FIG. It is embedded rearward and covered with a cover 4.

FIG. 3 shows a rear view of this state as viewed from the back of the chair C. However, the cover 4 is omitted. That is, when viewed from a person sitting behind the chair C, the left and right dedicated speakers 2R and 2L are lined up toward the user on the back of the front chair C. The distance from the outer edge of each of the left and right dedicated speakers 2R and 2L to the outer edge of the armrest is 30 cm or more when viewed from the center line of the chair C in order to reduce the influence of acoustic interference between the adjacent chairs C. It is desirable to do.

The three-dimensional sound reproducing device PA shown in FIG.
Is a dedicated speaker 2 provided in each chair as described above.
R, 2L, and a device for transmitting an audio signal to the front normal speakers 7R, 7L. At least, each dedicated speaker 2R, 2L is configured to transmit an audio signal processed by a stereo dipole. ing.

Here, the stereo dipole method is one of the techniques for sound image localization. First, the sound image localization technology
Depending on the position and direction of the sound source, the frequency components that reach the left and right ears, i.e., timbres, are affected by the transmission system such as a room or space, the reflection, diffraction, and resonance at the listener's head, pinna, and shoulders. It is a technology that applies different things.

Specifically, the sound image localization technique adds a process based on a head-related transfer function that causes a difference in intensity, a frequency component, and a phase shift of a sound wave to sounds heard by the left and right ears. That makes them feel as if they are coming from a particular direction.

Examples of such a sound image localization technique include:
Binaural recording and the like are known in addition to the stereo dipole. For example, binaural recording is a technology that reproduces the sound field by controlling the sound pressure transmitted to both ears of the listener, and reaches the both ears with a microphone placed at the position of both ears of a dummy head similar to a human head This is a technology for recording and reproducing sound as it is. Although this binaural recording is excellent in the sense of localization and presence in the original sound field, the reproduction is practically limited to headphones, and there are problems such as the influence of the characteristics of the headphones and uncomfortable feeling when worn.

On the other hand, the stereo dipole method used in the present embodiment is a technique for reproducing a three-dimensional sound with two speakers arranged close to each other, and the sounds from the left and right speakers are reversed by a digital filter adapted to the type of sound source. By canceling a phenomenon (called crosstalk) reaching the ears of the side and electrically synthesizing the above-described head-related transfer functions according to the desired angle and distance in the three-dimensional space, arbitrary The virtual sound source is arranged at the position of. Processing for such an audio signal is referred to as processing by a stereo dipole.

According to such a stereo dipole system, the speaker installation space is smaller than that of a trans-aural system in which left and right speakers are installed at positions separated from each other, and the listener can experience the 3D effect. The range that can be made is wide, and the localization of the sound image is also stable. Further, in the stereo dipole method, a sound source by conventional stereo recording or binaural recording can be reproduced three-dimensionally without using a rear speaker or the like.

That is, the three-dimensional sound reproduction device PA is configured to send an acoustic signal processed by the above-mentioned stereo dipole to at least each of the dedicated speakers 2R and 2L. As shown in FIG.
The apparatus includes an original sound generation unit 11, an acoustic localization calculation unit 12, a crosstalk cancellation calculation unit 13, a second crosstalk cancellation calculation unit 14, and an output control unit 15.

The original sound generating means 11 reproduces an acoustic signal recorded in advance on a medium such as a sound track of a projection film, or synthesizes it by a computer or the like to generate an original acoustic signal. For example, a control circuit for reading a signal or the like from a recording medium, an amplifier circuit for amplifying the level of the read signal, an A / D conversion circuit, and the like may be appropriately combined. Here, it is assumed that the stereo sound signal generated as the original sound in this manner is output to the normal speakers 7R and 7L via an amplifier or other means.

The sound localization calculating means 12 is a part for adding sound localization to the sound signal provided from the original sound generating means 11. Further, the crosstalk canceling calculation means 13 performs processing for canceling crosstalk of each channel generated when the sound signal is output from the left and right speakers with respect to the sound signal output from the sound image localization calculation means 12. This is the part to apply.

Further, the second crosstalk canceling calculation means 14 converts each of the dedicated speakers 2R,
This is a part for performing processing for canceling crosstalk occurring between chairs adjacent to each other when outputting from 2L.

The output control unit 15 also outputs the acoustic signals processed by the crosstalk cancellation calculation means 13 and the second crosstalk cancellation calculation means 14 to the dedicated speakers 2 for the left and right channels provided in each chair.
This is means for outputting from R and 2L, and includes means such as a D / A conversion circuit and an amplifier.

Note that, as shown in FIG.
, It is desirable that only the dedicated speakers 2R and 2L be provided in a row. The last row of chairs has a dedicated speaker 2
Since R and 2L are not essential, dedicated speakers 2R and 2L
It is possible to use a chair CX without a head.

[2. Operation] The present embodiment configured as described above operates as follows. [2-1. Outline of Operation] In the present embodiment (FIG. 1), a sound signal corresponding to an image or the like on the stage or the screen S is transmitted to the dedicated speakers 2R and 2L provided in each chair C by the three-dimensional sound reproducing device PA. Is sent to the front normal speakers 7R and 7L, and especially the dedicated speakers 2R and 2L.
, An audio signal processed by a stereo dipole is sent.

[2-2. Concrete action] More specifically,
In the three-dimensional sound reproduction device PA (FIG. 4), first, the original sound generation means 11 reproduces an acoustic signal recorded in advance on a medium such as a sound track of a projection film, or synthesizes the sound signal with a computer or the like, thereby obtaining the original sound. Generate an acoustic signal. Thus, the original sound generation means 11
Is split into two systems, one of which is output to the normal speakers 7R and 7L as normal stereo sound.

The following processing is performed on the other acoustic signal by a digital filter adapted to the type of sound source. That is, for this acoustic signal, first, the sound localization calculating means 12 electrically synthesizes a head-related transfer function according to a desired angle and distance in the three-dimensional space, so that the virtual signal is virtually added to an arbitrary position in space. Processing for arranging sound sources, that is, for adding sound localization is performed.

Subsequently, the sound signal is subjected to a process for canceling the crosstalk between the respective channels, which occurs when the sound signal is output from the left and right speakers, by the crosstalk canceling calculating means 13. Further, following such processing, the second crosstalk canceling calculation unit 14 cancels the crosstalk between the chairs adjacent to each other when the sound signals are output from the dedicated speakers 2R and 2L. To perform processing.

The output control unit 15 outputs the sound signal processed as described above by the sound localization calculation means 12, the crosstalk cancellation calculation means 13 and the second crosstalk cancellation calculation means 14 to each chair C. Output from the dedicated speakers 2R and 2L of the left and right channels provided in.

As a result, at each position of the hall, the exclusive speakers 2R and 2L provided on the back of the chair in front of
Since the sound processed by the stereo dipole method is heard, three-dimensional sound with excellent sound image localization can be enjoyed.

That is, in the technique of sound image localization using a speaker, a specific position (referred to as a control point) viewed from the speaker.
The output signal of each speaker is processed so that the best sound image localization effect can be obtained near such a control point on the premise that there is a listener. For this reason, even if the stereo dipole method is applied, if all audience members only listen to the sound of the large speakers as in the past, the more the person who is closer to the end shifted from the control point installed near the center of the hall ,
There is a problem that the effect of sound image localization is reduced due to the influence of a crosstalk component or the like.

On the other hand, in the present embodiment, the hole H
Any person sitting in any of the chairs will be at the control point of the sound output based on the stereo dipole method from the dedicated speakers 2R and 2L provided in front of him, so that the three-dimensional sound with excellent sound image localization can be obtained. You can enjoy it.

[3. Effect] As described above, in the present embodiment, the dedicated speakers 2R and 2L are provided in each of the chairs C, so that the person who listens to the sound can sit on any chair C or CX in the hall H and the chair in front of him. By using the stereo dipole system using the dedicated speakers 2R and 2L provided on the back of the user, it is possible to enjoy a three-dimensional sound with excellent sound localization.

In this embodiment, the sounds of the dedicated speakers 2R and 2L provided on the back of the chair in front reach the ears of each person.
Of the exclusive speaker 2R, 2 of the chair next to
Since the crosstalk from L is canceled, the localization of the sound image becomes clear.

Further, in this embodiment, at each position of the hall, the dedicated speakers 2R, 2R provided on the back of the chair in front of them.
In addition to enjoying stereoscopic sound due to excellent sound image localization with the stereo dipole method using L, sound characteristics different from the dedicated speakers 2R and 2L can be obtained by using the normal speakers 7R and 7L provided in front of the hall and the like. It is possible to enjoy the powerful and realistic sound due to the reverberation of the whole hall H.

[4. Other Embodiments] The present invention is not limited to the above embodiments, but includes other embodiments as exemplified below. For example, a hall means a facility configured so that a plurality of people can hear sounds regardless of the name, and a roof or wall having a specific structure is not essential.

As for the dedicated speaker, it is not essential to embed it in the backrest as shown in FIG. 2. For example, a thin speaker may be attached to the surface of the backrest.
Further, the specific configuration of the three-dimensional sound reproducing device is free, and it is not essential to provide only one in the hall H, but it may be provided in a separate room such as an acoustic control room, or may be provided for each type of original sound. It may be provided.

Further, specific algorithms and various characteristic values for operations for sound image localization and crosstalk cancellation can be freely determined. It is also possible to freely provide dedicated speakers 2R and 2L for all chairs. In addition, the sound signal processed by the stereo dipole is output not only to the dedicated speakers 2R and 2L but also to the normal speaker 7R.
It is also possible to output to R and 7L.

[0042]

As described above, according to the present invention,
By providing a speaker in each chair, it is possible to provide a three-dimensional sound reproduction technology, that is, a three-dimensional sound reproduction system and a hall, in which an excellent sound image localization effect can be obtained at any place.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a configuration of a hole in an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the chair according to the embodiment of the present invention as viewed from the side.

FIG. 3 is a view of the chair according to the embodiment of the present invention as viewed from the back.

FIG. 4 is a functional block diagram showing a configuration of a three-dimensional sound reproduction device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Backrest 2 (R, L) ... Dedicated speaker 3 ... Soundproof material 4 ... Cover 5 (R, L) ... Armrest 7 (R, L) ... Normal speaker 11 ... Original sound generation means 12 ... Sound localization calculation means 13 ... Cross Talk cancellation calculation means 14 ... Second crosstalk cancellation calculation means 15 ... Output control means H ... Hall C, CX ... Chair PA ... Three-dimensional sound reproduction device S ... Stage or screen

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuzo Okamoto 3-1-25 Omorinishi, Ota-ku, Ota-ku, Tokyo No. 204 Tominheim Im (72) Inventor Shigetoshi Uchida 2-40-1 Kitahonmachi, Funabashi-shi, Chiba Prefecture Bright City 621 No. (72) Inventor Haruo Hamada 2-2-16 Sekimae, Musashino-shi, Tokyo F-term (reference) 5D011 AA02 5D062 AA11 BB03 BB10 CC13 CC15

Claims (3)

[Claims] 1. A plurality of chairs provided on a backrest with two left and right speakers facing the back, sound image localization calculating means for adding sound localization to a recorded or synthesized sound signal, and this sound image localization The sound signal output from the calculating means is subjected to processing by crosstalk canceling calculating means for performing processing for canceling crosstalk of each channel generated when the sound signal is output from the left and right speakers. A three-dimensional sound reproduction device for sending the sound signal to each of the speakers. 2. The second crosstalk canceling device according to claim 2, wherein the three-dimensional sound reproduction device performs a process for canceling a crosstalk between chairs adjacent to each other when the sound signal is output from each speaker. Arithmetic means; and means for outputting, from the left and right channel speakers provided in each of the chairs, an audio signal subjected to the processing for canceling each of the crosstalks. The three-dimensional sound reproduction system according to claim 1. 3. A plurality of chairs arranged vertically and horizontally by providing two left and right first speakers on a backrest, and at least two left and right second speakers provided at least in front of each of the chairs. A sound image localization calculating means for adding sound localization to a recorded or synthesized sound signal, and the sound signal output from the sound image localization calculating means is output from left and right speakers A crosstalk canceling operation means for performing processing for canceling crosstalk of each channel occurring in the above, and a sound signal subjected to the processing by the three-dimensional sound reproduction device for sending at least to each of the first speakers; A three-dimensional sound reproduction hall characterized by having a.